-cracy

a combining form occurring in loanwords from Greek (aristocracy; democracy); on this model used, with the meaning “rule,” “government,” “governing body,” to form abstract nouns from stems of other origin:

word-forming element forming nouns meaning "rule or government by," from French -cratie or directly from Medieval Latin -cratia, from Greek -kratia "power, might; rule, sway; power over; a power, authority," from kratos "strength," from PIE *kratus "power, strength" (see hard). The connective -o- has come to be viewed as part of it. Productive in English from c.1800.